Web: resize the viewer; 3D views turn, move and zoom like the phones - #37

Two web viewer fixes: the viewer can be resized, and the 3D views now turn, move and zoom like the phones and the window.

Resize the viewer

• The line between the thread and the viewer is a handle. It shows the resize cursor, and dragging it sets the viewer's width (the thread keeps at least 360 px, the viewer 320).
• The width is kept in the browser. A double-click on the handle gives the usual share back.
• Not on phone-width screens, where the viewer is full screen.

3D controls (solid.js)

The old camera was a turntable. Its pan ignored the tilt, its wheel zoomed at the centre, and a touchpad's two-finger scroll arrived as wheel events, so trying to move the model zoomed it. It now uses the phones' free orbit (Orbit, ported from PlotView.kt):

• Mouse: left drag turns, and the model under the pointer follows it. Right or middle drag, or shift/ctrl+drag, moves the model in the view plane. Alt+drag rolls. The wheel zooms at the pointer, bounded by the fitted distance. Double-click fits.
• Touchpad: two fingers move the model and a pinch zooms. The same applies on boards and schematics (plot2d.js).
• Touch screen: one finger turns; two fingers move, pinch and twist.
• The hints under the tabs name the new controls.

Tested

• scripts/check.sh and scripts/test.sh pass.
• bun test/tools/orbit_test.ts (new, 15 checks):
  • A drag right or down turns the near side with the pointer.
  • Pan follows the pointer.
  • Zoom keeps the point under the pointer.
  • Zoom bounds.
  • The axes stay square after many turns.
  • Touchpad vs. mouse wheel vs. pinch classification.
• Playwright on a hub with a real board:
  • Resize: the cursor, drag, both limits, kept across a reload, double-click reset.
  • 3D: turn, right-drag pan, zoom at a corner, touchpad pan, pinch, refit.
  • Board: touchpad pan.
  • No page errors.

Note: a touchpad is told from a mouse wheel by its small or sideways steps. A smooth-scrolling mouse with very fine steps could read as a touchpad and pan. Ctrl+wheel still zooms.

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